package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Collections;
import java.util.List;

@Service
@Slf4j
public class SetmealServiceImpl implements SetmealService {
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private DishMapper dishMapper;

    @Transactional
    @Override
    public void saveWithRel(SetmealDTO setmealDTO) {
        // 1. 往setmeal表添加
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmealMapper.insert(setmeal);

        // 2. 往setmeal_dish批量添加关系
        Long setmealId = setmeal.getId();
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if(setmealDishes != null && setmealDishes.size() != 0) {
            setmealDishes.forEach(setmealDish -> setmealDish.setSetmealId(setmealId));
            setmealDishMapper.insertBatch(setmealDishes);
        }
    }

    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    @Override
    public void startOrStop(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if(status == StatusConstant.ENABLE){
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if(dishList != null && dishList.size() > 0){
                dishList.forEach(dish -> {
                    if(StatusConstant.DISABLE == dish.getStatus()){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }

        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }

    @Override
    public SetmealVO getById(Long id) {
        SetmealVO setmealVO = setmealMapper.selectVoById(id);
        List<SetmealDish> setmealDishes = setmealDishMapper.selectBySetmealId(id);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    @Transactional
    @Override
    public void updateWithRel(SetmealDTO setmealDTO) {
        // 1. 修改setmeal表
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        setmealMapper.update(setmeal);

        // 2. 修改setmeal_dish表，先删原有，再添加现在
        Long setmealId = setmealDTO.getId();
        setmealDishMapper.deleteBatch(Collections.singletonList(setmealId));
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if(setmealDishes != null && setmealDishes.size() != 0) {
            setmealDishes.forEach(setmealDish -> setmealDish.setSetmealId(setmealId));
            setmealDishMapper.insertBatch(setmealDishes);
        }
    }

    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        // 1.判断状态，停售才能删除
        Long enableCount = setmealMapper.selectEnableCount(ids);
        if(enableCount > 0) {
            log.info("{}中有起售套餐，删除失败", ids);
            throw new DeletionNotAllowedException("其中有起售套餐，删除失败");
        }
        // 2.setmeal_dish表，删除套餐与菜品关系
        setmealDishMapper.deleteBatch(ids);
        // 3.setmeal表，删除套餐
        setmealMapper.deleteBatch(ids);
    }

    @Override
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    @Override
    public List<DishItemVO> getDishItemById(Long id) {
        return dishMapper.getDishItemBySetmealId(id);
    }
}
